They are ferocious predators as well, using a sharp tongue called a radula like a rasp to scrape away at the shell of their prey, lick-drilling and spitting an acidic substance until they can kill their prey and slurp-remove it from the shell. It’s this radula that creates those perfect jewelry holes you see on the beach. In this first photo below, we actually interrupted the moon snail’s lunch. As you can see, they’ll prey on bivalves and univalves alike.